J04031 Brake Circuit Check-Out Procedure J4-3
EQUIPMENT REQUIRED
Included on the last page of this module is a data
sheet to record the information observed during the
hydraulic brake system check-out procedure. The
data sheet can be removed, copied, and used during
the check-out procedure.
• Steps indicated in this manner should be
recorded on the data sheet for reference.
The following equipment will be necessary to prop-
erly check-out the hydraulic brake circuit.
a. Hydraulic brake schematic, refer to Section
"R" this manual.
b. Calibrated pressure gauges:
-Two 0-5000 psi (0-34,475 kPa) range.
-Three 0-3000 psi (0-20,685 kPa) range.
c. One PB6039 female quick disconnect and
hose long enough to reach from brake cabi-
net to the inside of the operator's cab for
each gauge.
d. Accumulator charging kit (EB1759 or equiva-
lent) with gauges and dry nitrogen.
NOTE: A gas intensifier pump will be required, if
using "T type" nitrogen bottles.
e. Clear plastic hose and bucket for bleeding
brakes.
f. Volt/ohm meter with leads and two 24 inch
(61 mm) leads with alligator clips.
BRAKE CIRCUIT ABBREVIATIONS
AA Automatic Apply Pressure
AF2 Accumulator, Front Brake
AF1 Supply Pressure to Dual Controller for
Front Brakes
AR2 Accumulator, Rear Brake
AR1 Supply Pressure to Dual Controller for
Rear Brakes
BF Brake Pressure, Front (11, Figure 4-1)
BL Brake Lock Apply Pressure
BR Brake Pressure, Rear (11, Figure 4-1)
CV1 Check Valve, Rear
CV2 Check Valve, Front
CV3 Check Valve, Park Brake
LS1 Shuttle Valve
HS1 Low Pressure Emergency Apply Shut-
tle Apply Valve
LAP1 Pressure Tap Test Port
Low Accumulator Pressure
LAP2 Low Accumulator Pressure Switch
{N.C., 2350 ± 75 psi (16.2 MPa)}
NV1 Rear Accumulator Manual Drain Valve
NV2 Front Accumulator Manual Drain Valve
ORF1 Orifice (0.062 in.)
ORF2 Orifice (0.100 in.)
PK1 & 2 Park Brake Release Pressure
PP3 Pressure Tap Test Port
Brake Lock Pressure
PR1 Pressure Reducing Valve
PR2 Park Brake Pressure Regulator (To
Release)
PS1 Automatic Apply Valve
SP1 Supply Oil Inlet
SP3 Pressure Tap Test Port
Brake Circuit Supply Oil Pressure
SV1 Brake Lock Solenoid
SV2 Park Brake Solenoid
T1 & T3 Return to Tank
To Next Page
Loading...
